Cat Ba Monthly Rainfall & Precipitation
This page shows both the average monthly rainfall and the number of rainy days in Cat Ba, Hai Phong Municipality, Vietnam. These averages rely on historical data collected over 30 years, from 1990 to 2020. Let's explore the details to provide you with a complete overview.
Cat Ba has a notably wet climate with abundant precipitation, recording 1948 mm (77 in) of rainfall per year. It does, however, have a distinct rainy season during certain months. Have a look at our detailed charts below to see how precipitation varies throughout the year.
Monthly Precipitation Levels
The average number of days each month with precipitation (> 0.2 mm (0.01 in))
The seasons in Cat Ba, bring significant changes in precipitation. The wettest month, August, receives heavy rainfall, with an average of 415 mm (16 in) of precipitation. This rainfall is distributed across 16 rainy days.
In contrast, the driest month, February, experiences much less rainfall, totaling 39 mm (1.5 in) over 11 rainy days. These distinct seasonal differences provide diverse experiences throughout the year.August, the wettest month, has a maximum daytime temperature of 31°C (88°F). The city receives 175 hours of sunshine in this period. During the driest month February you can expect a temperature of 20°C (68°F). For more detailed insights into the city's temperatures, visit our Cat Ba Temperature page.
Daily Historical Precipitation
49-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in June
Explore Cat Ba's Historical Precipitation: 1976-2026
Browse day-by-day precipitation records for Cat Ba spanning 51 years. Select any month and year to see actual rainfall and snowfall recorded on each day.
Annual Rainfall in Vietnam: City Comparison
The map below shows the annual precipitation across Vietnam. You can also select the different months in case you are interested in a specific month.
heavy rainfall
high
moderate
low
almost none
Cat Ba vs World: Rainfall Compared
Cat Ba's average annual precipitation is 1948 mm (77 in). Let's compare this to some popular worldwide tourist destinations:
In Lisbon, Portugal, the average annual precipitation is 774 mm (30 in), characterized by wet winters and dry summers typical of the Mediterranean climate.
In Shanghai, China, the annual average precipitation is 1347 mm (53 in), with a humid subtropical climate.
Perth, Australia, receives 565 mm (22 in) of rainfall annually, mostly during the winter months.
Mumbai, India, experiences a tropical monsoon climate with 1860 mm (73 in) of annual rainfall, with the majority of precipitation happening during the monsoon season from June to September.
Precipitation amounts are measured using specific gauges installed at weather stations, collecting both rain and snow and any other type of precipitation. Rainfall is measured directly in millimeters, while that from snow and ice is obtained by melting it. Automated systems often incorporate heaters to make this easier.
Information from these stations is transmitted via Wi-Fi, satellite, GPS, or telephone connections to central monitoring networks. This information is immediately updated and integrated into weather models and forecasts.
- The U.S. has a significant number of thunderstorms every year, with over 14.6 million taking place across the world annually.
- Approximately 70% of lightning bolts strike land rather than oceans.
- A storm named John was the longest-lasting Pacific tropical storm, continuing for 31 days. As it crossed the dateline twice, it changed status from a hurricane to a typhoon and back to a hurricane.
For more detailed information about Cat Ba's weather, including sunshine hours, humidity levels, and temperature data, visit our Cat Ba Climate page.
